Added URL checker CI job.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

.gitlab-ci.yml

@@ -13,7 +13,6 @@ stages:
   - test
   - deploy_pages
   - deploy_pypi
-  - deploy_conda
   - cleanup
 
 
@@ -45,6 +44,15 @@ test_styles:
     when: always
 
 
+test_urls:
+  stage: test
+  script:
+    - source /root/miniconda3/bin/activate ci_env
+    - pip install urlchecker
+    - urlchecker check . --file-types .py,.rst,.md,.json
+  when: always
+
+
 test_py_tools_ds_install:
   stage: test
   script: